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Cardoso, Elsa M.; Esgalhado, André J.; Patrão, Luís; Santos, Mónica; Neves, Vasco Pinto; Martinez, Jorge; Patto, Maria Assunção Vaz; Silva, Helena; Arosa, Fernando A.
Annals of hematology, 09/2018, Letnik: 97, Številka: 9Journal Article
Polycythemia vera (PV) is a myeloproliferative neoplasm characterized by overproduction of red blood cells. We have performed a comprehensive characterization of blood immune cells for expression of naïve and memory receptors as well as β 2 m-associated and β 2 m-free MHC class I heavy chains, also known as closed and open conformers, respectively, in PV patients and age-matched controls (CTR). We show that the peripheral CD3 + CD8 + T cell pool in PV patients is clearly divided into two discrete populations, a more granular CD3 + CD8 high T cell population enriched in effector-memory CD45RA + T cells (CD8 + T EMRA ) when compared to CTR ( P < 0.001), and a less granular CD3 + CD8 int T cell population that is completely absent in the CTR group (78 vs. 0%, P < 0.001) and is a mixture of naïve (CD8 + T N ) and CD8 + T EMRA cells expressing intermediate levels of CD28, i.e., CD3 + CD8 int CD28 int . While the percentage of CD3 + CD8 int T N cells correlated positively with the number of erythrocytes, the percentage of CD3 + CD8 int T EMRA correlated negatively with the number of platelets. Finally, we report that PV patients’ lymphocytes and monocytes display lower levels of closed (W6/32 + ) MHC-I conformers at the cell surface while exhibiting increased amounts of open (HC-10 + ) MHC-I conformers. The implications of this distinctive immune signature are discussed.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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